A kind of sheet gear and pinion press mounting frock

Abstract

The utility model discloses a kind of sheet gear and pinion press-fit tool, including upper pressure head subassembly, guide subassembly and support subassembly.The pressure head of upper pressure head subassembly is driven to realize down with the cooperation of pressure rod;Guide subassembly is accurately positioned to pinion and sheet gear respectively through shaft inner hole guide pressure rod and guide seat, and installation angle is assisted control by limiting pin;Support subassembly is connected guide seat and support seat using reset spring, and provide elastic buffer and automatic reset function.Working, pressure rod drives pressure head to press pinion, and reset spring is compressed by pushing guide seat, until pinion and sheet gear end face are pasted to complete press-fit.The tool is positioned by double guide and elastic support structure, and press-fit precision, efficiency and applicability are significantly improved, and it is suitable for small and medium batch multi-species production scene.

Description

Technical Field

[0001] This utility model belongs to the technical field of automotive intermediate shaft transmission equipment, and relates to a tooling for press-fitting a gear and a gear shaft. Background Technology

[0002] In the current booming development of the new energy vehicle industry, the transmission case, as a core component of power transmission, directly affects the power output, efficiency, and reliability of the entire vehicle. The intermediate shaft assembly, as a key component of the transmission case, places extremely high demands on its manufacturing precision and assembly quality. Currently, intermediate shaft assemblies are often manufactured by separately producing the gear shaft and disc gear parts, and then combining them through a press-fit process. This separate manufacturing-press-fitting process can meet the special performance requirements of different parts and facilitates production processing and quality control, and is widely used in the industry.

[0003] However, to address the potential for parts to detach after press-fitting, welding the mating surfaces of the gear shaft and the gear disc has become a common practice. While the introduction of welding effectively improves the connection reliability of the components, it also brings new technical challenges. During welding, to avoid the adverse effects of the carburized layer on weld quality, the mating surface weld section is usually left uncarburized, while the rest of the component undergoes carburizing to enhance wear resistance and strength. This results in significant differences in hardness between different parts of the same component. Due to this inconsistent hardness, if the tooling positioning and guiding accuracy is insufficient during assembly, the surface of the parts can easily be damaged, causing dimensional deviations. Furthermore, it can lead to welding defects, such as weak welds and uneven weld seams, severely affecting the overall performance and service life of the intermediate shaft assembly. Therefore, developing highly precise tooling positioning and guiding technology is crucial for ensuring the quality and reliability of the intermediate shaft assembly of the new energy vehicle transmission box, and it is also an important technical issue that urgently needs to be addressed in the current new energy vehicle manufacturing field. Utility Model Content

[0004] The purpose of this invention is to solve the technical problem that the welding of gear shafts and gear discs in the prior art leads to low assembly reliability, and to provide a tooling for press-fitting gear discs and gear shafts.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] This utility model discloses a tooling for press-fitting a gear and a gear shaft, including an upper press head assembly, a guide assembly, and a support assembly;

[0007] The upper pressure head assembly includes a pressure rod and a pressure head, wherein the pressure head is disposed at the bottom of the pressure rod;

[0008] The guide assembly includes an inner bore guide rod, a guide seat, and a limiting pin. The inner bore guide rod is vertically fixed inside the guide seat, and the limiting pin is disposed on the side of the guide seat. The guide seat is used to guide the gear plate. The inner bore guide rod is used to guide the gear shaft.

[0009] The support assembly includes a support base and a return spring. The guide seat is disposed on the upper part of the support base, and the return spring is disposed between the bottom of the guide seat and the bottom of the support base.

[0010] The pressure rod drives the pressure head to press down on the end face of the gear shaft. The gear shaft pushes the guide seat down, compressing the return spring until the gear shaft and the end face of the gear are in contact, thus completing the press-fitting of the gear shaft and the gear.

[0011] Furthermore, the pressure head is a replaceable pressure head.

[0012] Furthermore, the guide seat is a hollow cylindrical structure, and a mounting base is horizontally arranged inside the guide seat. The mounting base is used to fix the guide rod of the shaft inner hole.

[0013] Furthermore, the outer diameter of the guide seat is smaller than the inner diameter of the gear.

[0014] Furthermore, the outer diameter of the guide seat is smaller than the outer diameter of the gear shaft.

[0015] Furthermore, the guide rod inside the shaft is a cylindrical structure.

[0016] Furthermore, the diameter of the guide rod inside the shaft is smaller than the inner diameter of the gear shaft.

[0017] Furthermore, the top end of the guide rod in the inner hole of the shaft is a circular conical cap.

[0018] Furthermore, the inner diameter of the support seat is larger than the outer diameter of the guide seat, and it fits snugly against the guide seat.

[0019] Furthermore, the side of the support base is provided with a vertical limiting sliding hole for the limiting pin to slide up and down.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] This utility model discloses a tooling for press-fitting a gear and a gear shaft. The gear shaft is axially positioned by a guide rod within the shaft's inner hole, while the gear's mounting position is radially constrained by a guide seat, forming a dual positioning mechanism of "shaft-hole fit + seat guidance." This effectively prevents eccentricity or misalignment between the gear shaft and the gear during press-fitting. The return spring in the support assembly allows the guide seat to move downwards synchronously with the gear shaft during press-fitting. The spring force offsets some of the press-fitting impact, preventing tooth surface damage caused by rigid contact and improving assembly reliability. After press-fitting, removing the driving force of the pressure rod allows the return spring to automatically push the guide seat back, facilitating quick workpiece handling. When the return spring pushes the guide seat upwards, a limiting pin slides within the support seat, ensuring reset accuracy and eliminating the need for manual adjustment.

[0022] Furthermore, since the pressure head is a highly worn component that directly contacts the end face of the gear shaft, a detachable design allows for the replacement of only the pressure head itself, rather than the entire pressure rod, thus preventing the entire upper pressure head assembly from being scrapped due to localized wear. For gear shafts of different diameters, a series of pressure heads can be pre-fabricated, enabling rapid assembly. The replacement process does not require disassembling the pressure rod, eliminating the risk of stripped threads or loss of positioning accuracy due to repeated disassembly and assembly.

[0023] Furthermore, the hollow columnar structure of the guide seat ensures that the pressing force is evenly distributed along the circumference of the guide seat, avoiding local stress concentration. The guide rod in the inner hole of the shaft is fixed to the horizontal mounting base to resist lateral load. When the gear shaft moves down along the guide rod in the inner hole of the shaft, the guide seat sinks as a whole, ensuring that the gear and the gear shaft always move coaxially.

[0024] Furthermore, the cylindrical geometry of the guide rod inside the shaft provides a 360° uniformly distributed radial constraint force, eliminating stress concentration points of the polygonal guide rod and preventing scratches on the inner hole of the gear shaft; the round conical cap at the top eliminates the risk of sharp edges scratching the inner hole of the gear shaft, and when the gear shaft is detached after press-fitting, the chamfer of the conical cap avoids the "vacuum adsorption" effect.

[0025] Furthermore, the design of a support seat with an inner diameter larger than the guide seat's outer diameter, and a tight fit, forms a stable nested guide structure. During press-fitting, this structure effectively limits the radial offset of the guide seat, ensuring that the gear shaft and the gear remain coaxial in the vertical direction, significantly improving press-fitting accuracy and ensuring the smoothness and reliability of gear transmission. Simultaneously, the tight-fitting structural design enhances the overall rigidity of the tooling, preventing deformation caused by uneven stress and extending the tooling's service life.

[0026] Furthermore, the vertical limiting sliding hole on the side of the support provides a track for the limiting pin to slide up and down, allowing the limiting pin to flexibly adjust its limiting height according to the different thicknesses of the gears or the pressing stroke requirements. When changing gears of different specifications, operators do not need to disassemble or replace the limiting components; they can simply slide the limiting pin to quickly adjust the limiting position, significantly improving the tooling's adaptability to multiple parts and meeting the needs of small-batch, multi-variety production. In addition, the cooperation between the limiting sliding hole and the limiting pin further enhances the stability of the guide seat during the pressing process, preventing horizontal displacement and ensuring the safety and consistency of the pressing process. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this utility model and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0028] Figure 1 This is a structural diagram of the assembly of the tooling for pressing the gear and gear shaft of this utility model;

[0029] Figure 2 This is a cross-sectional view of the assembly structure of the gear and gear shaft press-fitting fixture of this utility model;

[0030] Figure 3 This is a structural diagram of the press head assembly of the gear and gear shaft press fitting tool of this utility model;

[0031] Figure 4 This is a cross-sectional view of the pressure head assembly of the gear and gear shaft press fitting tool of this utility model;

[0032] Figure 5 This is a structural diagram of the guide assembly for the press-fitting tooling of the gear and gear shaft of this utility model;

[0033] Figure 6 This is a cross-sectional view of the guide assembly for press-fitting the gear and gear shaft of this utility model;

[0034] Figure 7 This is a structural diagram of the support assembly for the press-fitting tooling of the gear and gear shaft of this utility model;

[0035] Figure 8 This is a cross-sectional view of the support assembly for the press-fitting tooling of the gear and gear shaft of this utility model;

[0036] Figure 9 This is a structural diagram of the tooling for pressing the gear and gear shaft together according to this utility model.

[0037] The components are: 1. Upper pressure head assembly; 1-1. Pressure rod; 1-2. Pressure head; 2. Guide assembly; 2-1. Shaft inner hole guide pressure rod; 2-2. Guide seat; 2-3. Limiting pin; 3. Support assembly; 3-1. Return spring; 3-2. Support seat; 4. Parts; 4-1. Gear shaft; 4-2. Sprocket gear. Detailed Implementation

[0038] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. The components of the embodiments of this utility model described and marked in the accompanying drawings can typically be arranged and designed in various different configurations.

[0039] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

[0040] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0041] In the description of the embodiments of this utility model, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the utility model product is in use, they are only for the convenience of describing the utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the utility model. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0042] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0043] In the description of the embodiments of this utility model, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0044] The present invention will now be described in further detail with reference to the accompanying drawings:

[0045] See Figures 1-9 This utility model discloses a tooling for pressing a gear and a gear shaft, including an upper press head assembly 1, a guide assembly 2 and a support assembly 3; the upper press head assembly 1 includes a press rod 1-1 and a press head 1-2, the press rod 1-1 is fixed to the press slide block by two pairs of bolts; the press head 1-2 adopts a replaceable design and is connected to the bottom of the press rod 1-1 by four bolts.

[0046] The guide assembly 2 includes a guide seat 2-2, a shaft inner hole guide rod 2-1, and a limiting pin 2-3. The guide seat 2-2 is a hollow cylindrical structure. The outer diameter of the guide seat 2-2 is smaller than the inner diameter of the gear 4-2, and the outer diameter of the guide seat 2-2 is smaller than the outer diameter of the gear shaft 4-1. A horizontal mounting base is provided inside the guide seat 2-2. The shaft inner hole guide rod 2-1 is vertically fixed to the horizontal mounting base by three evenly distributed bolts. The shaft inner hole guide rod 2-1 is a cylindrical structure. The diameter of the shaft inner hole guide rod 2-1 is smaller than the inner diameter of the gear shaft 4-1. The top end of the shaft inner hole guide rod 2-1 is machined into a circular conical cap to facilitate the insertion of the gear shaft 4-1. The limiting pin 2-3 is connected to the side wall of the guide seat 2-2 through a threaded hole.

[0047] The support assembly 3 includes a support base 3-2 and a return spring 3-1; the support base 3-2 is a cylindrical structure with an inner diameter larger than the outer diameter of the guide seat 2-2, and the two are coaxially fitted together; a vertical limiting sliding hole is opened on the side of the support base 3-2 for the limiting pin (2-3) to slide up and down; the return spring 3-1 is sleeved between the bottom flange of the guide seat 2-2 and the bottom surface of the inner cavity of the support base 3-2.

[0048] The working process / working principle of this utility model is as follows:

[0049] Material loading stage: Insert the inner hole of the gear 4-2 into the outer circle of the guide seat 2-2, so that its lower end face contacts the top of the support seat 3-2; insert the outer circle of the gear shaft 4-1 into the inner hole of the guide seat 2-2, and at the same time, insert the inner hole of the gear shaft 4-1 into the guide pressure rod 2-1 of the shaft inner hole. At this time, the two parts, the gear 4-2 and the gear shaft 4-1, remain separated.

[0050] Pressing stage: The press drives the pressure rod 1-1 to move down, the pressure head 1-2 contacts the end face of the gear shaft 4-1 and applies pressure; the gear shaft 4-1 pushes the guide seat 2-2 to move down, and the return spring 3-1 is compressed; when the lower end face of the gear shaft 4-1 is fully in contact with the upper end face of the gear 4-2, the pressing is completed.

[0051] Reset phase: The pressure rod 1-1 rises, and the reset spring 3-1 pushes the guide seat 2-2 and the pressing assembly to move upward; the limit pin 2-3 slides upward along the sliding hole of the support seat 3-2 until it is limited at the top of the contact hole (at this time, the guide seat returns to its initial height).

[0052] Material unloading stage: The operator removes the pressed components (the interference fit between the gear and the gear shaft) from the guide seat 2-2.

[0053] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A tooling for press-fitting a sprocket gear and a gear shaft, characterized in that, It includes an upper pressure head assembly (1), a guide assembly (2), and a support assembly (3); The upper pressure head assembly (1) includes a pressure rod (1-1) and a pressure head (1-2), wherein the pressure head (1-2) is disposed at the bottom of the pressure rod (1-1); The guide assembly (2) includes a shaft inner hole guide rod (2-1), a guide seat (2-2), and a limiting pin (2-3). The shaft inner hole guide rod (2-1) is vertically fixed inside the guide seat (2-2), and the limiting pin (2-3) is disposed on the side of the guide seat (2-2). The guide seat (2-2) is used to guide the gear plate (4-2). The shaft inner hole guide rod (2-1) is used to guide the gear shaft (4-1). The support assembly (3) includes a support base (3-2) and a return spring (3-1). The guide seat (2-2) is located on the upper part of the support base (3-2), and the return spring (3-1) is located between the bottom of the guide seat (2-2) and the bottom of the support base (3-2).

2. The gear and gear shaft press-fitting fixture according to claim 1, characterized in that, The pressure head (1-2) is a replaceable pressure head.

3. The gear and gear shaft press-fitting fixture according to claim 1, characterized in that, The guide seat (2-2) is a hollow cylindrical structure. A mounting base is horizontally arranged inside the guide seat (2-2), and the mounting base is used to fix the guide pressure rod (2-1) inside the shaft.

4. The gear and gear shaft press-fitting fixture according to claim 3, characterized in that, The outer diameter of the guide seat (2-2) is smaller than the inner diameter of the disc gear (4-2).

5. The gear and gear shaft press-fitting fixture according to claim 3, characterized in that, The outer diameter of the guide seat (2-2) is smaller than the outer diameter of the gear shaft (4-1).

6. The gear and gear shaft press-fitting fixture according to claim 1, characterized in that, The guide rod (2-1) inside the shaft hole is a cylindrical structure.

7. The gear and gear shaft press-fitting fixture according to claim 6, characterized in that, The diameter of the guide rod (2-1) inside the shaft hole is smaller than the inner diameter of the gear shaft (4-1).

8. The gear and gear shaft press-fitting fixture according to claim 6, characterized in that, The top of the guide rod (2-1) in the inner hole of the shaft is a circular conical cap.

9. The gear and gear shaft press-fitting fixture according to claim 1, characterized in that, The inner diameter of the support (3-2) is larger than the outer diameter of the guide (2-2), and it fits into the guide (2-2).

10. The gear and gear shaft press-fitting fixture according to claim 1, characterized in that, The side of the support base (3-2) is provided with a vertical limiting sliding hole for the limiting pin (2-3) to slide up and down.

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